Galvanometer control circuit of laser television and laser television

Abstract

The invention relates to the technical field of display, and provides a galvanometer control circuit of a laser television and the laser television. The control circuit comprises a display control assembly, a main control chip, a galvanometer driving assembly, a galvanometer and a fault detection assembly, the fault detection assembly comprises a first circuit and a detection control assembly, and the first circuit is connected with the galvanometer driving assembly and the detection control assembly. The first circuit is used for providing detection voltage for the detection control assembly according to input voltage of the galvanometer, the detection control assembly is connected with the display control assembly, the display control assembly is further used for sending a detection trigger signal to the detection control assembly, and the detection control assembly is used for controlling the galvanometer according to the detection voltage when receiving the detection trigger signal. According to the application, the short circuit or open circuit problem of the galvanometer can be quickly positioned and alarm prompt can be carried out, the conditions of fault judgment missing, even galvanometer coil burning and the like are reduced, and the accuracy is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and more specifically, to a galvanometer control circuit of a laser television, and a laser television. Background Art

[0002] The display chip of laser TV generally samples a digital micromirror device (DMD). Since there is a gap between each reflective mirror on the DMD, there is a gap between the pixels of the projected image. Currently, the vibration-static vibration offset light method is used to fill the pixel gaps and improve the resolution.

[0003] At present, the galvanometer of laser TV is driven by a coil motor. The driving circuit can be connected to the analog-to-digital conversion chip through the serial peripheral interface (SPI), and then amplified by the first-stage amplifier and the static operating point is changed, switched to the positive and negative voltage range, and then the current feedback power drive output is realized through the second-stage amplifier.

[0004] However, in the above-mentioned driving circuit, if the coil has a short circuit, open circuit, overcurrent or other faults, it means that the galvanometer has a hardware fault. The above-mentioned method can only detect the fault of the coil open circuit, and cannot detect local short circuit or overcurrent. It is easy to miss the fault or even burn the galvanometer coil. Summary of the invention

[0005] The exemplary implementation of the present application provides a galvanometer control circuit for a laser television, and a laser television, for solving the problem in the related art that only the fault of coil open circuit can be detected, while local short circuit or overcurrent and the like cannot be detected, which easily leads to missed faults and even burning of the galvanometer coil.

[0006] In a first aspect, an embodiment of the present application provides a galvanometer control circuit for a laser television, comprising: a display control component, a main control chip, a galvanometer drive component, a galvanometer, and a fault detection component;

[0007] The display control component is connected to the main control chip and the galvanometer drive component respectively; the galvanometer drive component is connected to the galvanometer; the galvanometer drive component is connected to the galvanometer;

[0008] The main control chip is used to supply power to the display control component;

[0009] The display control component is used to send a current control signal to the galvanometer drive component, and the current control signal is used to control the galvanometer drive component to provide a galvanometer drive current to the galvanometer to drive the galvanometer to deflect;

[0010] The fault detection component includes: a first circuit and a detection control component;

[0011] The first circuit is connected to the galvanometer drive component and the detection control component respectively, and the detection control component is connected to the main control chip; the first circuit is used to detect the input voltage of the galvanometer and provide a detection voltage to the detection control component according to the input voltage;

[0012] The detection control component is connected to the display control component; the display control component is also used to send a detection trigger signal to the detection control component;

[0013] The detection control component is used to send fault warning information to the main control chip according to the detection voltage when receiving the detection trigger signal.

[0014] In some possible implementations, the detection control component is specifically used to:

[0015] Determining the fault type of the galvanometer according to the detection voltage;

[0016] According to the fault type, the fault alarm information is sent to the main control chip.

[0017] In some possible implementations, the detection control component is specifically used to:

[0018] Acquire a reference voltage, where the reference voltage includes voltage change thresholds corresponding to multiple fault types;

[0019] The fault type of the galvanometer is determined according to the detection voltage and the reference voltage.

[0020] In some possible implementations, the detection control component is specifically used to:

[0021] Determining a voltage amplitude of the detection voltage;

[0022] Comparing the voltage amplitude with the voltage change thresholds corresponding to the multiple fault types to obtain a comparison result;

[0023] The fault type of the galvanometer is determined according to the comparison result.

[0024] In some possible implementations, the fault detection component further includes: an analog-to-digital converter ADC and a voltage-dividing resistor;

[0025] The galvanometer drive assembly comprises: a basic drive circuit and a second circuit;

[0026] The basic driving circuit is connected to the second circuit, the second circuit is connected to the galvanometer, and the basic driving circuit is connected to the display control component; the display control component is specifically used to: send the current control signal to the basic driving circuit, the current control signal is used to control the basic driving component, and provide the galvanometer driving current to the galvanometer through the second circuit;

[0027] The first circuit is connected to the ADC; the ADC is connected to the detection control component; the first circuit is connected to the voltage-dividing resistor, and the first circuit sets a positive bias voltage through the voltage-dividing resistor, converts the input voltage of the galvanometer into a unidirectional positive voltage, and provides the unidirectional positive voltage to the ADC;

[0028] The ADC is used to provide the detection voltage to the detection control component according to the unidirectional positive voltage.

[0029] In some possible implementations, the voltage-dividing resistor includes: a first resistor and a second resistor; the first resistor and the second resistor are connected in series.

[0030] In a possible implementation, the fault detection component further includes: a third resistor;

[0031] The third resistor is connected to the input end and the output end of the first circuit respectively.

[0032] In a second aspect, an embodiment of the present application provides a galvanometer control circuit for a laser television, comprising: a display control component, a main control chip, a galvanometer drive component, a galvanometer, and a fault detection component;

[0033] The display control component is connected to the main control chip and the galvanometer drive component respectively; the galvanometer drive component is connected to the galvanometer;

[0034] The main control chip is used to supply power to the display control component; the display control component is used to send a pulse width modulation (PWM) signal to the galvanometer drive component; the galvanometer drive component is used to drive the galvanometer to deflect according to the PWM signal;

[0035] The fault detection component includes: a fourth resistor, a fifth resistor, and the detection control component;

[0036] The fourth resistor and the fifth resistor are respectively connected to the galvanometer drive component; the detection control component is connected to the galvanometer drive component; the fourth resistor and the fifth resistor serve as voltage sampling points;

[0037] The galvanometer driving component is used to determine the fault type of the galvanometer according to the voltage sampling point;

[0038] The detection control component is specifically used to send fault alarm information to the main control chip according to the fault type.

[0039] In a possible implementation, the galvanometer drive assembly is specifically used for:

[0040] collecting a first voltage and a second voltage at the voltage sampling point;

[0041] Obtaining a preset voltage threshold, where the preset voltage threshold includes voltage thresholds corresponding to multiple fault types;

[0042] Comparing the first voltage and the second voltage with voltage thresholds corresponding to the multiple fault types respectively to obtain a comparison result;

[0043] The fault type of the galvanometer is determined according to the comparison result.

[0044] In a possible implementation, the galvanometer drive assembly is specifically used to:

[0045] According to the fault type of the galvanometer, a fault status identifier corresponding to the fault type is written into the fault register.

[0046] In a possible implementation, the detection control component is specifically used to:

[0047] When an interrupt signal is detected, a fault status identifier is obtained from the fault register;

[0048] The fault warning information is generated according to the fault status identifier.

[0049] In a possible implementation, the detection control component is specifically used to:

[0050] Obtaining a fault status identifier from the fault register at preset time intervals;

[0051] The fault warning information is generated according to the fault status identifier.

[0052] In a third aspect, an embodiment of the present application provides a galvanometer control circuit for a laser television, comprising: a display control component, a main control chip, a galvanometer drive component, a galvanometer, and a fault detection component;

[0053] The main control chip is connected to the display control component; the galvanometer drive component is connected to the display control component; the galvanometer drive component is connected to the galvanometer;

[0054] The main control chip is used to supply power to the display control component;

[0055] The galvanometer driving component is used to drive the galvanometer to deflect according to the current control signal generated by the display control component;

[0056] The fault detection component is connected to the galvanometer drive component and the main control chip respectively;

[0057] The fault detection component is used to perform fault detection on the galvanometer according to the input voltage of the galvanometer, and send fault alarm information to the main control chip according to the fault type of the galvanometer.

[0058] In a fourth aspect, the present application provides a galvanometer control circuit for a laser television, comprising: a display control component, a main control chip, a galvanometer drive component, a galvanometer, and a fault detection component;

[0059] The main control chip is connected to the display control component; the display control component is connected to the galvanometer drive component; the galvanometer drive component is connected to the galvanometer;

[0060] The main control chip is used to supply power to the display control component;

[0061] The galvanometer driving component is used to drive the galvanometer to deflect according to the pulse width modulation (PWM) signal sent by the display control component;

[0062] The fault detection component is connected to the galvanometer drive component and the main control chip respectively;

[0063] The galvanometer drive assembly is also used to detect the fault type of the galvanometer;

[0064] The fault detection component is used to send fault alarm information to the main control chip according to the fault type.

[0065] In a fifth aspect, an embodiment of the present application provides a galvanometer control circuit of a laser television such as the laser television described in any one of the first to fourth aspects.

[0066] The present application provides a galvanometer control circuit of a laser TV and a laser TV, wherein the control circuit includes a display control component, a main control chip, a galvanometer drive component, a galvanometer, and a fault detection component, wherein the main control chip is connected to the display control component, the galvanometer drive component is connected to the display control component, the galvanometer drive component is connected to the galvanometer, the main control chip is used to power the display control component, and the display control component is used to drive the galvanometer deflection through the galvanometer drive component. Among them, the fault detection component includes: a first circuit and a detection control component, wherein the first circuit is connected to the galvanometer drive component and the detection control component respectively, the first circuit is used to detect the input voltage of the galvanometer, and according to the input voltage, provide the detection voltage to the detection control component, the detection control component is connected to the display control component, the display control component is also used to send a detection trigger signal to the detection control component, and the detection control component is used to send a fault alarm information to the main control chip according to the detection voltage when receiving the detection trigger signal. Based on the above control circuit, the present application can quickly locate the galvanometer short circuit or open circuit problem and give an alarm prompt, reduce the occurrence of fault missed judgment, or even burn the galvanometer coil, and improve the accuracy.

[0067] These and other aspects of the present application will become more apparent from the following description of the embodiment(s). BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0069] Figure 1 A schematic diagram of the structure of a galvanometer control circuit of a laser TV provided in an embodiment of the present application;

[0070] Figure 2 A schematic diagram showing the rotation of a galvanometer mirror is exemplified for the embodiment of the present application;

[0071] Figure 3 A schematic diagram of a galvanometer is exemplarily shown for the embodiment of the present application;

[0072] Figure 4 A schematic diagram of the structure of a galvanometer control circuit of a laser TV provided in an embodiment of the present application;

[0073] Figure 5 The schematic diagram of the output voltage of the first circuit 1051 changing with time in a no-fault situation is exemplarily shown in the embodiment of the present application;

[0074] Figure 6The embodiment of the present application exemplarily shows a schematic diagram of the output voltage of the first circuit 1052 changing with time when the galvanometer 104 is short-circuited;

[0075] Figure 7 The embodiment of the present application exemplarily shows a schematic diagram of the output voltage of the first circuit 1052 changing with time when the galvanometer 104 is disconnected;

[0076] Figure 8 The schematic diagram of the output voltage of the first circuit 1052 changing with time in the case of a negative power failure is exemplarily shown in the embodiment of the present application;

[0077] Fig. 9 A schematic diagram of the structure of another galvanometer control circuit of a laser television provided in an embodiment of the present application;

[0078] Fig.10 A schematic diagram of the structure of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0079] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0080] Based on the exemplary embodiments described in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the claims attached to this application. In addition, although the disclosure in this application is introduced according to one or several exemplary examples, it should be understood that each aspect of the disclosure can also constitute a complete implementation method separately.

[0081] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0082] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise indicated. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, for example, they can be implemented according to orders other than those given in the diagrams or descriptions of the embodiments of this application.

[0083] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0084] The term "module" as used in this application refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0085] At present, the galvanometer of laser TV is driven by a coil motor. The driving circuit has two driving modes: analog-to-analog converter (DAC) + op amp drive and pulse width modulation (PWM).

[0086] The DAC+ op amp driving circuit can be connected to the analog to digital converter chip (ADC) via SPI, and then amplified by the first-stage op amp and the static operating point is changed, switched to the positive and negative voltage range, and then the current feedback power drive output is realized through the second-stage op amp.

[0087] In this driving circuit, if the coil has a short circuit, open circuit, overcurrent or other faults, it means that the galvanometer has a hardware fault, but the above method cannot determine the state of the coil and cannot handle the coil fault in time.

[0088] In the PWM drive circuit, the microcontroller unit (MCU) outputs a PWM signal, which directly drives the galvanometer coil through an H-bridge circuit. The galvanometer coil current is controlled by adjusting the duty cycle of the PWM signal. This control method is an open-loop control method, and the control state of the galvanometer coil needs to be returned to the MCU.

[0089] In this driving mode, only the coil open circuit fault can be detected, and the local short circuit or overcurrent cannot be detected, which can easily lead to missed faults or even burning of the galvanometer coil.

[0090] Therefore, the present application provides a galvanometer control circuit for a laser TV. The fault detection circuit in the control circuit directly performs fault detection on the galvanometer coil, so that the detection control component can determine the fault type of the galvanometer coil based on the detection information, wherein the fault types include galvanometer coil short circuit, galvanometer coil open circuit, negative power supply fault, and galvanometer overcurrent, etc. The fault detection circuit can have different structures relative to different coil drive circuits (i.e. corresponding to different drive modes). The present application can quickly locate the galvanometer short circuit or open circuit problem through the fault detection circuit, issue an alarm and perform protection, reduce the occurrence of missed faults or even burning of the galvanometer coil, and improve the accuracy.

[0091] The application scenario of the present application can be to detect the fault of the galvanometer of the laser TV when the laser TV displays various information such as text, images, videos, etc., to avoid the failure of the galvanometer coil and the effect of image display.

[0092] In addition to providing picture display functions, laser TVs can also provide intelligent network TV functions with computer support functions, including but not limited to network TV, smart TV, Internet Protocol Television (IPTV), etc.

[0093] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments may exist independently or in combination with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0094] Figure 1 This is a schematic diagram of the structure of a galvanometer control circuit of a laser TV provided in an embodiment of the present application. Figure 1 As shown in the figure, the galvanometer control circuit 10 of the laser TV includes a display control component 101, a main control chip 102, a galvanometer driving component 103, a galvanometer 104, and a fault detection component 105.

[0095] The main control chip 102 is connected to the display control component 101 , the galvanometer driving component 103 is connected to the display control component 101 , and the galvanometer driving component 103 is connected to the galvanometer 104 .

[0096] The main control chip 102 is used to supply power to the display control component 101. The display control component 101 is used to send a current control signal to the galvanometer drive component 103. The current control signal is used to control the galvanometer drive component 103 to provide a galvanometer drive current to the galvanometer 104 to drive the galvanometer 104 to deflect.

[0097] In a possible implementation, the display control component 101 may be a digital light processor (DLP), and the main control chip 102 may be a system on chip (SOC).

[0098] Specifically, the schematic diagram of the rotation of the galvanometer 104 is as follows: Figure 2 As shown, the galvanometer generates magnetic force through coils and permanent magnets to drive the glass to deflect, and the glass deflection achieves the offset of the corresponding projection image due to the refraction of light.

[0099] For example, Figure 3 As shown, Figure 3 Schematic diagram of the galvanometer 104. Four coils are set on the four sides of the galvanometer 104 glass, namely coils A, B, C, and D. By connecting the coils on the opposite sides in series, deflection in the X-axis and Y-axis directions is achieved. Among them, the offset △y satisfies the following formula:

[0100]

[0101] Wherein, t is the length of one side of the galvanometer glass, and θ is the offset angle.

[0102] In a possible implementation, the fault detection component 105 includes: a first circuit 1051 and a detection control component 1052 .

[0103] The first circuit 1051 is connected to the galvanometer driving component 103 and the detection control component 1052 respectively. The first circuit 1051 is used to detect the input voltage of the galvanometer 104 and provide a detection voltage to the detection control component 1052 according to the input voltage.

[0104] The detection control component 1052 is connected to the display control component 101. The display control component 101 is also used to send a detection trigger signal to the detection control component 1052. The detection trigger signal is used to trigger the detection control component to determine the fault type of the galvanometer 104 according to the detection voltage.

[0105] The detection control component 1052 is used to send fault alarm information to the main control chip according to the detection voltage when receiving the detection trigger signal.

[0106] In a possible implementation, the first circuit 1051 may be an amplifier, and the detection control component 1052 may be an MCU. Specifically, the detection control component 1052 may be connected to the galvanometer drive component 103 and the main control chip 102 via an integrated circuit bus (Inter-Integrated Circuit, I2C).

[0107] In a possible implementation, the fault types of the galvanometer 104 may include a galvanometer coil short circuit, a galvanometer coil open circuit, a negative power supply fault, a galvanometer overcurrent, and the like.

[0108] In a possible implementation, after the detection control component 1052 determines the fault type of the galvanometer 104, it can send fault alarm information to the main control chip 102 through I2C to perform a fault alarm. The fault alarm information may include a fault status identifier, such as any predefined identifier or signal, for example, a fault status identifier 0 may indicate a short circuit of the galvanometer coil, a fault status identifier 1 may indicate an open circuit of the galvanometer coil, a fault status identifier 2 may indicate a negative power supply fault, a fault status identifier 3 may indicate an overcurrent of the galvanometer, and may also be indicated in other forms, which are only examples and are not limited in this application.

[0109] In this embodiment, the control circuit includes a display control component, a main control chip, a galvanometer drive component, a galvanometer, and a fault detection component. The main control chip is connected to the display control component, the galvanometer drive component is connected to the display control component, the galvanometer drive component is connected to the galvanometer, the main control chip is used to power the display control component, and the display control component is used to drive the galvanometer deflection through the galvanometer drive component. Among them, the fault detection component includes: a first circuit and a detection control component, the first circuit is connected to the galvanometer drive component and the detection control component respectively, the first circuit is used to detect the input voltage of the galvanometer, and according to the input voltage, provide a detection voltage to the detection control component, the detection control component is connected to the display control component, the display control component is also used to send a detection trigger signal to the detection control component, and the detection control component is used to send a fault alarm information to the main control chip according to the detection voltage when receiving the detection trigger signal. Based on the above control circuit, the present application can quickly locate the galvanometer short circuit or open circuit problem and provide an alarm prompt and protection, reduce the occurrence of fault missed judgment, or even burn the galvanometer coil, and improve the accuracy.

[0110] Next, another galvanometer control circuit 10 of a laser television provided in the present application is described through another embodiment.

[0111] Figure 4 This is a schematic diagram of the structure of a galvanometer control circuit of a laser TV provided in an embodiment of the present application. Figure 4 As shown in the figure, in some embodiments, the galvanometer control circuit 10 of the laser TV includes a display control component 101, a main control chip 102, a galvanometer driving component 103, a galvanometer 104, and a fault detection component 105.

[0112] The connection relationship between the display control component 101, the main control chip 102, the galvanometer driving component 103, the galvanometer 104, and the fault detection component 105 can refer to the above embodiment and will not be repeated here.

[0113] In a possible implementation, the fault detection component 105 further includes: an analog-to-digital converter ADC1053 and a voltage-dividing resistor, and the galvanometer driving component 103 includes: a basic driving circuit 1031 and a second circuit 1032 .

[0114] The basic driving circuit 1031 is connected to the second circuit 1032, the second circuit 1032 is connected to the galvanometer 104, the basic driving circuit 1031 is connected to the display control component 101, and the display control component 101 is specifically used to: send a current control signal to the basic driving circuit 1031, the current control signal is used to control the basic driving component 1031, and provide a galvanometer driving current to the galvanometer 104 through the second circuit 1032 to drive the galvanometer 104 to deflect.

[0115] The first circuit 1051 is connected to 1053ADC, ADC1053 is connected to the detection control component 1052, and the first circuit 1051 is connected to the voltage divider resistor. The first circuit 1051 sets the positive bias voltage through the voltage divider resistor, converts the input voltage of the galvanometer 104 into a unidirectional positive voltage, and provides a unidirectional positive voltage to ADC1053.

[0116] ADC1053 is used to provide a detection voltage to the detection control component 1052 according to the unidirectional positive voltage.

[0117] In a possible implementation, the second circuit 1032 may be an amplifier. Figure 4 The exemplary first circuit 1051 and the second circuit 1032 are operational amplifiers.

[0118] Specifically, Figure 4 As shown, the basic driving circuit 1031 is connected to the positive input terminal of the second circuit 1032, and the negative input terminal and output terminal of the second circuit 1032 are connected to the galvanometer 104. The basic driving circuit 1031 and the second circuit 1032 realize power driving output for the galvanometer 104. The negative input terminal of the first circuit 1051 is connected to the voltage dividing resistor to convert the positive and negative voltages output by the second circuit 1032 into a unidirectional positive voltage, and the voltage range is within the input voltage range of ADC1053. The display control component 101 is connected to the basic driving circuit 1031 via SPI.

[0119] The second circuit 1032 is powered by a dual power supply and has a current feedback output to realize positive and negative current driving of the galvanometer 104. At the same time, the positive input terminal of 8 is connected to the output terminal of the second circuit 1032 (that is, the output terminal of the second circuit 1032 is connected to the second circuit 1032). The output terminal of the second circuit 1032 is connected to ADC1053 via a first connecting line. ADC1053 is connected to the detection control component 1052 via I2C to realize closed-loop control of the galvanometer coil. The detection control component 1052 can read the coil voltage of the galvanometer 104 via I2C, and compare it with the actual coil voltage of the galvanometer 104 under normal circumstances to determine the fault type of the galvanometer 104, so as to realize fault reporting.

[0120] For example, under normal conditions, that is, when there is no fault, the waveform of the output voltage of the first circuit 1051 changing with time is as follows: Figure 5 As shown, the output voltage of the first circuit 1051 is the coil voltage of the galvanometer 104 under normal conditions read by the detection control component 1052. For the convenience of comparison, Figure 5 , a waveform diagram of the output voltage of the second circuit 1032 changing with time is given, and the output voltage of the second circuit 1032 is the driving voltage of the galvanometer 104. In the embodiment of the present application, the output voltage of the first circuit 1051 under normal conditions can be used as a reference to determine whether the galvanometer 104 is faulty.

[0121] When the galvanometer 104 is short-circuited, the voltage drop of the output voltage of the first circuit 1051 will gradually decrease according to the degree of the short-circuit. Figure 6 As shown, the dotted line waveform is the output voltage of the first circuit 1051 under a short circuit condition, and the solid line waveform is the output voltage of the first circuit 1051 under a normal condition.

[0122] When the galvanometer 104 is disconnected, the voltage drop is infinite, such as Figure 7 As shown, the dotted line waveform is the output voltage of the first circuit 1051 in the disconnected state, and the vibration amplitude is the largest, and the solid line waveform is the output voltage of the first circuit 1051 in the normal state.

[0123] In the event of a negative supply failure, such as Figure 8 As shown, the waveform in the dotted box is the output voltage of the first circuit 1051 in the open circuit condition.

[0124] In one possible implementation, after receiving the detection trigger signal sent by the display control component 101, the detection control component 1052 can determine the fault type of the galvanometer 104 according to the detection voltage provided by ADC1053, and send fault alarm information to the main control chip 102 according to the fault type.

[0125] In a possible implementation, the detection control component 1052 may obtain a reference voltage, where the reference voltage includes voltage change thresholds corresponding to a plurality of fault types, and determine the fault type of the galvanometer 104 based on the detection voltage and the reference voltage.

[0126] Exemplarily, the voltage change thresholds corresponding to the various fault types may include a first threshold, a second threshold, a third threshold, and a fourth threshold, wherein the first threshold is a threshold corresponding to a short circuit of a galvanometer coil, the second threshold is a threshold corresponding to an overcurrent of a galvanometer, the third threshold is a threshold corresponding to a negative power supply fault, and the fourth threshold is a threshold corresponding to a short circuit of a galvanometer coil. The first threshold, the second threshold, the third threshold, and the fourth threshold may be set according to the actual circuit, and the present application does not limit the size of the first threshold, the second threshold, the third threshold, and the fourth threshold.

[0127] Specifically, the detection control component 1052 can determine the voltage amplitude of the detection voltage. Specifically, the voltage amplitude can be calculated according to the maximum and minimum values ​​of the detection voltage, and the voltage amplitude can be compared with the above-mentioned threshold to obtain a comparison result. According to the comparison result, the fault type of the galvanometer 104 is determined. Specifically, if the voltage amplitude is less than or equal to the first threshold, the fault type is determined to be a galvanometer coil short circuit. If the voltage amplitude is greater than the first threshold and less than or equal to the second threshold, the fault type is determined to be a galvanometer overcurrent. If the voltage amplitude is greater than the second threshold and less than or equal to the third threshold, the fault type is determined to be a negative power supply fault. If the voltage amplitude is greater than or equal to the fourth threshold, the fault type is determined to be a galvanometer coil open circuit.

[0128] In one possible implementation, Figure 4 As shown, the voltage divider resistor includes a first resistor and a second resistor, the first end of the first resistor is connected to the power supply, the second end of the first resistor is connected in series with the first end of the second resistor through a second connecting line, the second end of the second resistor is grounded, and the negative input end of the first circuit 1051 is connected to the second connecting line.

[0129] In a possible implementation, the fault detection component 105 further includes a third resistor, a first end of the third resistor is connected to the positive input end of the first circuit 1051 , and a second end of the third resistor is connected to the first connecting line.

[0130] It should be noted that the circuit structure of the basic driving circuit 1031 is as follows Figure 4 As shown, it consists of a DAC, an amplifier, five resistors and a capacitor. The specific connections of the DAC, amplifier, five resistors and a capacitor can be referred to Figure 4 A resistor and a capacitor connected in parallel with the galvanometer 104 also belong to the structure of the galvanometer drive circuit 103. For specific connections, please refer to Figure 4 . And in Figure 4In the embodiment, there is also a resistor in the fault detection component 105 connected to the positive input terminal of the first circuit 1051, that is, the positive input terminal of the first circuit 1051 is connected to the output terminal of the first circuit 1051 through the resistor.

[0131] In this embodiment, by connecting the positive input end of the first circuit 1051 in the fault detection component 105 with the output end of the second circuit 1032, and connecting it with the detection control component 1052 through ADC1053, the detection control component 1052 can perform fault detection on the galvanometer 104 according to the detection voltage provided by ADC1053, so as to send fault alarm information to the main control chip 102, realize closed-loop control of the galvanometer 104, reduce the occurrence of missed faults or even burning of the galvanometer coil, and improve the accuracy.

[0132] Next, another galvanometer control circuit 10 of a laser television provided in the present application is described through another embodiment.

[0133] Fig. 9 This is a schematic diagram of the structure of another galvanometer control circuit of a laser TV provided in an embodiment of the present application. Fig.10 As shown in the figure, in some embodiments, the galvanometer control circuit 20 of the laser TV includes a display control component 201, a main control chip 202, a galvanometer driving component 203, a galvanometer 204, and a fault detection component.

[0134] The main control chip 202 is connected to the display control component 201 , the display control component 201 is connected to the galvanometer driving component 203 , and the galvanometer driving component 203 is connected to the galvanometer 204 .

[0135] The main control chip 202 is used to supply power to the display control component 201. The display control component 201 is used to send a PWM signal to the galvanometer drive component 203. The galvanometer drive component 203 is used to drive the coil of the galvanometer 204 to rotate according to the PWM signal.

[0136] In a possible implementation, the galvanometer drive component 203 may be composed of a detection module and an H-bridge circuit, that is, the galvanometer 204 is directly driven by the H-bridge circuit. Fig. 9 As shown, the H-bridge circuit includes four transistors. The connections between the four transistors can be referred to Fig. 9 .

[0137] In a possible implementation, the fault detection component includes a fourth resistor, a fifth resistor, and a detection control component 2031. The fourth resistor and the fifth resistor are respectively connected to the galvanometer drive component 203, the detection control component 2031 is connected to the galvanometer drive component 203, the fourth resistor and the fifth resistor are used as voltage sampling points, the galvanometer drive component 203 is used to determine the fault type of the galvanometer 204 according to the voltage sampling points, and the detection control component 2031 is specifically used to send fault alarm information to the main control chip 202 according to the fault type.

[0138] Specifically, the galvanometer drive component 203 can collect a first voltage (measured by the voltage sampling point corresponding to the fourth resistor) and a second voltage (measured by the voltage sampling point corresponding to the fifth resistor) at a voltage sampling point through a detection module, and obtain a preset voltage threshold. The preset voltage threshold includes voltage thresholds corresponding to multiple fault types. The first voltage and the second voltage are respectively compared with the voltage thresholds corresponding to the multiple fault types to obtain a comparison result, and the fault type of the galvanometer is determined based on the comparison result.

[0139] Exemplarily, the voltage thresholds corresponding to multiple fault types include a first voltage threshold, a second voltage threshold and a third voltage threshold, wherein the first voltage threshold may be a threshold corresponding to a galvanometer overcurrent, the second voltage threshold may be a threshold corresponding to a galvanometer short circuit, and the third voltage threshold may be a threshold corresponding to a galvanometer open circuit, wherein the first voltage threshold is greater than the second voltage threshold, and the third voltage threshold is greater than the first voltage threshold, for example, the first voltage threshold is above 1V and below 2V, the second voltage threshold may be less than 1V, and the third voltage threshold is above 3V.

[0140] Specifically, taking the first voltage as an example, if the first voltage belongs to the first voltage threshold, the fault type is determined to be galvanometer coil overcurrent; if the first voltage belongs to the second voltage threshold, the fault type is determined to be galvanometer short circuit; if the first voltage belongs to the third voltage threshold, the fault type is determined to be galvanometer open circuit.

[0141] The determination of the second voltage is similar to that of the first voltage, and reference may be made to the first voltage, which will not be described in detail here.

[0142] That is, when any one of the first voltage and the second voltage belongs to the first voltage threshold, it can be determined that the galvanometer coil is overcurrent, and similarly for other fault types.

[0143] Correspondingly, the first voltage threshold, the second voltage threshold and the third voltage threshold correspond to different current thresholds respectively. Taking the first voltage threshold as an example, if the first voltage belongs to the first voltage threshold, it can be determined that the current corresponding to the first voltage (i.e., the galvanometer coil current) also belongs to the current threshold corresponding to the first voltage threshold, thereby determining the fault type of the galvanometer 204.

[0144] It should be noted that the detection module of the galvanometer drive component 203 can be implemented in software, or in software plus hardware, etc., and this application does not impose any limitation on this.

[0145] In one possible implementation, the detection module may write a fault status identifier corresponding to the fault type to the fault register corresponding to the galvanometer drive component 203 according to the fault type. Different identifiers may be used to correspond to different fault types. Please refer to the above embodiment and will not be repeated here.

[0146] The detection module can communicate with the detection control component 2031 through I2C. The detection control component 2031 is specifically used to send fault alarm information to the main control chip 202 according to the fault type.

[0147] Specifically, the detection control component 2031 can use an interrupt or polling method to read the fault register corresponding to the galvanometer drive component 203 through IC2 to generate fault alarm information.

[0148] The interrupt mode means that after the detection control component 2031 receives the interrupt signal sent by the galvanometer drive component 203, it reads the fault status identifier in the fault register through IC2 to generate fault alarm information according to the fault status identifier.

[0149] The polling method means that the detection control component 2031 can read the fault status identifier in the fault register through IC2 at preset time intervals to generate fault alarm information according to the fault status identifier.

[0150] Taking the case of galvanometer overcurrent as an example, in the case of abnormal overheating, the insulation layer of the galvanometer coil is prone to partial breakdown, causing a local coil short circuit. At this time, the coil can still work, but it cannot provide sufficient driving force and the current will rise. After determining that the galvanometer is overcurrent, an alarm can be issued to avoid damage to the galvanometer coil.

[0151] In this embodiment, the display control component 201 is used to send a PWM signal to the galvanometer drive component 203, so that the galvanometer drive component 203 can perform fault detection on the galvanometer 204 through the fault detection component to determine the fault type of the galvanometer coil 204, and send fault alarm information to the main control chip 202 according to the fault type. Based on the above control circuit, the present application can quickly locate the problems such as short circuit or open circuit of the galvanometer and issue an alarm prompt, reduce the occurrence of missed faults, or even burn the galvanometer coil, and improve the accuracy.

[0152] The present application also provides a display device, such as Fig.10As shown, the display device 200 includes: a tuner and demodulator 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, and at least one of a user interface.

[0153] In some embodiments, the controller 250 includes a processor, a video processor, an audio processor, a graphics processor, a random access memory (RAM), a read-only memory (ROM), and a first interface to an nth interface for input / output.

[0154] The display 260 includes a display screen component for presenting images, and a driving component for driving image display, a component for receiving image signals output from a controller, and a component for displaying video content, image content, and a menu control interface, as well as a user control user interface (UI).

[0155] The display 260 may be a laser display, a projection display, or a projection device and a projection screen.

[0156] The communicator 220 is a component for communicating with an external device or server according to various communication protocol types. For example, the communicator may include at least one of a wireless fidelity (WIFI) module, a Bluetooth module, a wired Ethernet module, other network communication protocol chips or a near field communication protocol chip, and an infrared receiver.

[0157] The user interface can be used to receive control signals from a control device (such as an infrared remote controller, etc.).

[0158] The detector 230 is used to collect signals from the external environment or the external interaction. For example, the detector 230 includes a light receiver, a sensor for collecting the intensity of ambient light; or, the detector 230 includes an image collector, such as a camera, which can be used to collect external environment scenes, user attributes or user interaction gestures; or, the detector 230 includes a sound collector, such as a microphone, etc., for receiving external sounds.

[0159] The external device interface 240 may include, but is not limited to, any one or more of the following: a high definition multimedia interface (HDMI), an analog or digital high definition component input interface (component), a composite video input interface (CVBS), a universal serial bus (USB), a red green blue (RGB) color mode port, etc. It may also be a composite input / output interface formed by the above multiple interfaces.

[0160] The tuner-demodulator 210 receives broadcast television signals via wired or wireless reception, and demodulates audio and video signals, such as Electronic Program Guide (EPG) data signals, from a plurality of wireless or wired broadcast television signals.

[0161] In some embodiments, the controller 250 and the tuner-demodulator 210 may be located in different separate devices, that is, the tuner-demodulator 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box.

[0162] The memory stores computer-executable instructions and various software control programs.

[0163] The controller 250 controls the operation of the display device 200 and responds to user operations through various software control programs stored in the memory. The controller 250 controls the overall operation of the display device 200. For example, in response to receiving a user command for selecting a UI object to be displayed on the display 260, the controller 250 can perform operations related to the object selected by the user command.

[0164] In some embodiments, the processor in the controller 250 can be at least one of: a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), RAM, ROM, a first interface to an nth interface for input / output, a communication bus (Bus), etc.

[0165] The user may input a user command through a graphical user interface (GUI) displayed on the display 260, and the user input interface receives the user input command through the graphical user interface (GUI). Alternatively, the user may input a user command through a specific sound or gesture, and the user input interface receives the user input command by recognizing the sound or gesture through a sensor.

[0166] "User interface" is the medium interface for interaction and information exchange between applications or operating systems and users. It realizes the conversion between the internal form of information and the form acceptable to users. The commonly used form of user interface is GUI, which refers to the user interface related to computer operation displayed in a graphical way. It can be an icon, window, control or other interface element displayed on the display screen of an electronic device, where the control can include icons, buttons, menus, tabs, text boxes, dialog boxes, status bars, navigation bars, widgets and other visual interface elements.

[0167] In some embodiments, the controller 250 may include a galvanometer control circuit of any of the above-mentioned laser televisions. The specific implementation method and technical effect are similar and will not be repeated here.

[0168] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs. When loading and executing computer program instructions on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. The computer program can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, data center, etc. that contains one or more available media integrations. Available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video disks (DVD)), or semiconductor media (eg, solid state disks (SSD)).

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0170] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A galvanometer control circuit for a laser television, characterized in that: include: Display control component, main control chip, galvanometer drive component, galvanometer, and fault detection component; The display control component is connected to the main control chip and the galvanometer drive component respectively; the galvanometer drive component is connected to the galvanometer; The main control chip is used to supply power to the display control component; The display control component is used to send a current control signal to the galvanometer drive component, and the current control signal is used to control the galvanometer drive component to provide a galvanometer drive current to the galvanometer to drive the galvanometer to deflect; The fault detection component includes: a first circuit and a detection control component; The first circuit is connected to the galvanometer drive component and the detection control component respectively, and the detection control component is connected to the main control chip; the first circuit is used to detect the input voltage of the galvanometer and provide a detection voltage to the detection control component according to the input voltage; The detection control component is connected to the display control component; the display control component is also used to send a detection trigger signal to the detection control component; The detection control component is used to send fault warning information to the main control chip according to the detection voltage when receiving the detection trigger signal.

2. The galvanometer control circuit according to claim 1, characterized in that: The detection control component is specifically used for: Determining the fault type of the galvanometer according to the detection voltage; According to the fault type, the fault alarm information is sent to the main control chip.

3. The galvanometer control circuit according to claim 2, characterized in that: The detection control component is specifically used for: Acquire a reference voltage, where the reference voltage includes voltage change thresholds corresponding to multiple fault types; The fault type of the galvanometer is determined according to the detection voltage and the reference voltage.

4. The galvanometer control circuit according to claim 3, characterized in that: The detection control component is specifically used for: Determining a voltage amplitude of the detection voltage; Comparing the voltage amplitude with the voltage change thresholds corresponding to the multiple fault types to obtain a comparison result; The fault type of the galvanometer is determined according to the comparison result.

5. The galvanometer control circuit according to any one of claims 1 to 4, characterized in that: The fault detection component also includes: an analog-to-digital converter ADC and a voltage-dividing resistor; The galvanometer drive assembly comprises: a basic drive circuit and a second circuit; The basic driving circuit is connected to the second circuit, the second circuit is connected to the galvanometer, and the basic driving circuit is connected to the display control component; the display control component is specifically used to: send the current control signal to the basic driving circuit, the current control signal is used to control the basic driving component, and provide the galvanometer driving current to the galvanometer through the second circuit; The first circuit is connected to the ADC; the ADC is connected to the detection control component; the first circuit is connected to the voltage-dividing resistor, and the first circuit sets a positive bias voltage through the voltage-dividing resistor, converts the input voltage of the galvanometer into a unidirectional positive voltage, and provides the unidirectional positive voltage to the ADC; The ADC is used to provide the detection voltage to the detection control component according to the unidirectional positive voltage.

6. The galvanometer control circuit according to claim 5, characterized in that: The voltage-dividing resistor includes: a first resistor and a second resistor; the first resistor and the second resistor are connected in series.

7. The galvanometer control circuit according to any one of claims 1 to 6, characterized in that: The fault detection component further includes: a third resistor; The third resistor is connected to the input end and the output end of the first circuit respectively.

8. A galvanometer control circuit for a laser television, characterized in that: include: Display control component, main control chip, galvanometer drive component, galvanometer, and fault detection component; The display control component is connected to the main control chip and the galvanometer drive component respectively; the galvanometer drive component is connected to the galvanometer; The main control chip is used to supply power to the display control component; The display control component is used to send a pulse width modulation (PWM) signal to the galvanometer drive component; The galvanometer driving component is used to drive the galvanometer to deflect according to the PWM signal; The fault detection component includes: a fourth resistor, a fifth resistor, and the detection control component; The fourth resistor and the fifth resistor are respectively connected to the galvanometer drive component; the detection control component is connected to the galvanometer drive component; the fourth resistor and the fifth resistor serve as voltage sampling points; The galvanometer driving component is used to determine the fault type of the galvanometer according to the voltage sampling point; The detection control component is specifically used to send fault alarm information to the main control chip according to the fault type.

9. The galvanometer control circuit according to claim 8, characterized in that: The galvanometer drive assembly is specifically used for: collecting a first voltage and a second voltage at the voltage sampling point; Obtaining a preset voltage threshold, where the preset voltage threshold includes voltage thresholds corresponding to multiple fault types; Comparing the first voltage and the second voltage with voltage thresholds corresponding to the multiple fault types respectively to obtain a comparison result; The fault type of the galvanometer is determined according to the comparison result.

10. The galvanometer control circuit according to claim 9, characterized in that: The galvanometer drive assembly is specifically used for: According to the fault type of the galvanometer, a fault status identifier corresponding to the fault type is written into the fault register.

11. The galvanometer control circuit according to claim 10, characterized in that: The detection control component is specifically used for: When an interrupt signal is detected, a fault status identifier is obtained from the fault register; The fault warning information is generated according to the fault status identifier.

12. The galvanometer control circuit according to claim 10, characterized in that: The detection control component is specifically used for: Obtaining a fault status identifier from the fault register at preset time intervals; The fault warning information is generated according to the fault status identifier.

13. A galvanometer control circuit for a laser television, characterized in that: include: Display control component, main control chip, galvanometer drive component, galvanometer, and fault detection component; The main control chip is connected to the display control component; the galvanometer drive component is connected to the display control component; the galvanometer drive component is connected to the galvanometer; The main control chip is used to supply power to the display control component; The galvanometer driving component is used to drive the galvanometer to deflect according to the current control signal generated by the display control component; The fault detection component is connected to the galvanometer drive component and the main control chip respectively; The fault detection component is used to perform fault detection on the galvanometer according to the input voltage of the galvanometer, and send fault alarm information to the main control chip according to the fault type of the galvanometer.

14. A galvanometer control circuit for a laser television, characterized in that: include: Display control component, main control chip, galvanometer drive component, galvanometer, and fault detection component; The main control chip is connected to the display control component; the display control component is connected to the galvanometer drive component; the galvanometer drive component is connected to the galvanometer; The main control chip is used to supply power to the display control component; The galvanometer drive assembly; Used to drive the galvanometer to deflect according to the pulse width modulation (PWM) signal sent by the display control component; The fault detection component is connected to the galvanometer drive component and the main control chip respectively; The galvanometer drive assembly is also used to detect the fault type of the galvanometer; The fault detection component is used to send fault alarm information to the main control chip according to the fault type.

15. A laser television, characterized in that: include: A galvanometer control circuit as described in any one of claims 1 to 7, a galvanometer control circuit as described in any one of claims 8 to 12, a galvanometer control circuit as described in claim 13, or a galvanometer control circuit as described in claim 14.

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